I am in need of a wiring diagram for a 1985 Houston Metro model 10 bus with a 748 Allison automatic transmission with a retarder. Can anyone help me figure out the wiring on this bus??

I need to know the wires that go from the retarder relay to the transmission brain box under the dash, etc. A diagram would be helpful as I need to know the wire numbers. I am in the process of trying to convert this old passenger bus into an entertainer bus for some friends who sing gospel music.

I need to know the wires that go from the retarder relay to the transmission brain box under the dash, etc. A diagram would be helpful as I need to know the wire numbers. I am in the process of trying to convert this old passenger bus into an entertainer bus for some friends who sing gospel music.

My 89 is DDEC/ATEC. The retarder is actuated by the foot treddle valve. I have a push button shift selector. Is this simular to what you are working on? I have the original 1989 NJT service manuals and can research. Did you cut your wires? Do you have the retarder "off" lite on the front of the 85? For some reason, I think the computer was mounted on the transmission in 1989. Mine barely works until I reach the last stage of the treddle valve, then it stops on a dime.

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